List of largest nebulae

Below is a list of the largest nebulae so far discovered, ordered by size. This list is prone to change because of inconsistencies between studies, their great distances from our stellar neighbourhood, and constant development of technology and engineering. Nebulae's boundaries are also undefined, and is also prone to change. Lastly, scientists are still defining the parameters and defining features of nebulae. Because of all these scientific inconsistencies, this list might be unreliable.

NGC 604, one of largest nebulae (H II region) is localed in the Triangulum Galaxy (viewed by the Hubble Space Telescope).

List
This list is incomplete; you can help by expanding it.
Legend
Lyman-alpha blob
Emission nebula
Interstellar cloud
Supernova remnant
List of the largest nebulae
Nebula Maximum dimension
(in light-years/parsecs)		 Type Notes
LAB Giant Concentration
(coinciding with SSA22 Protocluster)		 200,000,000 ly (61,000,000 pc)[1] complex of LαBs Also on record as one of the largest structures in the universe.
NGC 262 Halo Cloud 1,300,000 ly (400,000 pc)[2] H I region Spiral nebula surrounding NGC 262, which is one of the largest known galaxies.
Leo Ring 650,000 ly (200,000 pc)[3] HVC
Magellanic Stream 600,000 ly (180,000 pc)[4] complex of HVCs Connects the Large and Small Magellanic clouds; extends across 180° of the sky.
Lyman-alpha blob 1 300,000 ly (92,000 pc)[5] LαB Largest blob in the LAB Giant Concentration
Himiko Gas Cloud 55,000 ly (17,000 pc)[6] intergalactic cloud
(possible LαB)		 One of the most massive lyman-alpha blobs known
HVC 127-41-330 20,000 ly (6,100 pc)[7] HVC
Smith's Cloud 9,800 ly (3,000 pc)[8] HVC Extends about 20° of the sky
NGC 2404 2,000 ly (610 pc) H II region Largest known H II region, located in spiral galaxy NGC 2403
N11 2,000 ly (610 pc)[9] H II region
Tarantula Nebula 1,862 ly (571 pc)[10][lower-alpha 1] H II region Most active starburst region in the Local Group
NGC 595 1,746 ly (535 pc)[11] H II region
NGC 604 1,520 ly (470 pc)[12][13][lower-alpha 2] H II region Located in the Triangulum Galaxy
NGC 592 1,160 ly (360 pc)[14][15] H II region
N44 1,000 ly (310 pc)[16] Emission nebula
Ring Nebula (NGC 6822) 838 ly (257 pc) H II region
Gum Nebula 809–950 ly (248–291 pc)[17][18] Emission nebula
Bubble Nebula (NGC 6822) 758 ly (232 pc)[19][20][21] H II region
NGC 6188 600 ly (180 pc) Emission nebula
N119 570 ly (170 pc)[22] H II region Peculiar S-shape
Sh2-310 531–681 ly (163–209 pc)[23][lower-alpha 3] H II region Nebula surrounding VY Canis Majoris, which is one of largest known stars.
Carina Nebula 460 ly (140 pc)[24] H II region Nearest giant H II region to Earth
Dragonfish Nebula 450 ly (140 pc)[25] Emission nebula
Hubble 1925 III 419 ly (128 pc) H II region
Hubble 1925 I 379 ly (116 pc) H II region
RCW 49 350 ly (110 pc)[26] H II region
Heart Nebula 330 ly (100 pc) H II region
Westerhout 5 (Soul Nebula) 330 ly (100 pc) H II region
Henize 70 (N70 or DEM L301)[27] 300 ly (92 pc)[28] H II region The N 70 Nebula, in the Large Magellanic Cloud has a shell structure and is really a bubble in space. It is a "Super Bubble".
Barnard's Loop 300 ly (92 pc)[29][30] H II region
Sh2-54 252 ly (77 pc)[31][32] H II region
Prawn Nebula 250 ly (77 pc)[33] H II region
NGC 7822 150 ly (46 pc)[34] Emission nebula
IC 2944 142 ly (44 pc)[35][36] Emission nebula
Eagle Nebula 140 ly (43 pc)[37] H II region Part of another diffuse nebula IC 4703.
Rosette Nebula 130 ly (40 pc) H II region
Lagoon Nebula 110 ly (34 pc) H II region
NGC 3576 100 ly (31 pc) Emission nebula
Veil Nebula 100 ly (31 pc) Supernova remnant
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See also

Notes
  1. distance × sin( diameter_angle ) = 1,862 ly
  2. distance × sin( diameter_angle ) = 1,520 ly
  3. Those measuraments are based on an apparent diameter of 480 arcminutes (') plus an assumed distance of 1.5 kpc and the current distance of VY CMa which is about 1.17 kpc as the nebula is sometimes found to have the same distance as VY CMa.

References
  1. Ravilious, Kate. "Giant "Blob" is Largest Thing in Universe". National Geographic News. Archived from the original on June 4, 2011. Retrieved June 23, 2011.
  2. "The New York Times". Distant galaxy found to be largest known. 1987-03-13. Archived from the original on 2019-05-17. Retrieved 2019-05-17.
  3. Léo Michel-Dansa; Pierre-Alain Duc (2010). "The mysterious Leo giant gas ring explained by a billion year old collision between two galaxies". Canada France Hawaii Telescope. Archived from the original on 2013-10-10. Retrieved 2016-12-18.
  4. Kawata, Maddison & Gibson, Swinburne. "Magellanic Stream". Swinburne University of Technology. Archived from the original on October 21, 2018. Retrieved November 26, 2018.CS1 maint: multiple names: authors list (link)
  5. "Giant Space Blob Glows from Within". ESO Press Release. 17 August 2011. Archived from the original on 28 September 2011. Retrieved 18 August 2011.
  6. Hsu, Jeremy (2009-04-22). "Giant Mystery Blob Discovered Near Dawn of Time". SPACE.com. Archived from the original on 2009-04-23. Retrieved 2009-04-24.
  7. Josh Simon (2005). "Dark Matter in Dwarf Galaxies: Observational Tests of the Cold Dark Matter Paradigm on Small Scales" (PDF). Archived from the original (PDF) on September 13, 2006. Cite journal requires |journal= (help)
  8. Lockman, Felix J.; Benjamin, Robert A.; Heroux, A. J.; Langston, Glen I. (May 2008). "The Smith Cloud: A High-Velocity Cloud Colliding with the Milky Way". The Astrophysical Journal. 679 (1): L21. arXiv:0804.4155. Bibcode:2008ApJ...679L..21L. doi:10.1086/588838.
  9. "N11 complex in LMC". astronomy and observation. Archived from the original on 11 November 2017. Retrieved 5 November 2017.
  10. "Results for Tarantula Nebula". SEDS Students for the Exploration and Development of Space. Archived from the original on 2011-10-08. Retrieved 2007-05-08. 30 Doradus .. 49 kpc +- 3 kpc
  11. "NGC 595: A Great Diffuse Nebula in M33". Archived from the original on 28 January 2013. Retrieved 13 Jan 2013.
  12. Barba, Rodolfo (2004). "An in-depth analysis of a prototypical giant H II region: NGC 604". HST Proposal ID #10419: 10419. Bibcode:2004hst..prop10419B.
  13. "NASA/IPAC Extragalactic Database". Results for NGC 604. Archived from the original on 2011-08-11. Retrieved 2006-09-03.
  14. "NGC 592 NASA/IPAC Extragalactic Database Results". ned.ipac.caltech.edu. Archived from the original on 2018-10-31. Retrieved 2018-10-30.
  15. "Site of Professor C. Seligman: NGC 550 - 599". cseligman.com. Archived from the original on 2015-07-26. Retrieved 2018-10-31.
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  18. "result for Gum 12". Galaxy Map. Archived from the original on 2009-04-11. Retrieved 2018-11-15.
  19. Karachentsev et al. 2004
  20. Karachentsev & Kashibadze 2006
  21. Cannon et al. 2006
  22. Ambrocio-Cruz, P.; Rosado, M.; Laval, A.; Le Coarer, E.; Russeil, D.; Amram, P. (July 22, 2008). "Kinematic field of the S-shaped nebula N119 in the LMC" (PDF). Revista Mexicana de Astronomía y Astrofísica. 44: 355. Bibcode:2008RMxAA..44..355A. Archived (PDF) from the original on November 20, 2016. Retrieved November 15, 2018.
  23. Sharpless, Stewart (1959). "A Catalogue of H II Regions". The Astrophysical Journal Supplement Series. 4: 257. Bibcode:1959ApJS....4..257S. doi:10.1086/190049.
  24. "NGC 3372 - The Eta Carinae Nebula". Atlas of the Universe. Archived from the original on 2013-05-12. Retrieved 2013-10-01.
  25. "Dragonfish Coming at You in Infrared". NASA. Archived from the original on 2016-03-04. Retrieved 28 April 2017.
  26. NASA Astronomy Picture of the Day: Cosmic Construction Zone RCW 49 (3 June 2004)
  27. "N70. HENIZE 70 – Astrodrudis". Archived from the original on 2019-05-17. Retrieved 2019-05-17.
  28. "N70 Nebula in the Large Magellanic Cloud". www.eso.org. Archived from the original on 15 November 2018. Retrieved 15 November 2018.
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  30. O'Dell, C.R.; Ferland, G.J.; Porter, R.L.; van Hoof, P.A.M. (2011). "Physical Conditions in Barnard's Loop, Components of the Orion-eridanus Bubble, and Implications for the Warm Ionized Medium Component of the Interstellar Medium". The Astrophysical Journal. 733 (1): 9. arXiv:1103.2789. Bibcode:2011ApJ...733....9O. doi:10.1088/0004-637X/733/1/9.
  31. Sharpless, Stewart (December 1959). "A Catalogue of H II Regions". Astrophysical Journal Supplement. 4: 257. Bibcode:1959ApJS....4..257S. doi:10.1086/190049.
  32. Reipurth, B. (December 2008). "The Young Cluster NGC 6604 and the Serpens OB2 Association". Handbook of Star Forming Regions, Volume II: The Southern Sky. 5: 590. Bibcode:2008hsf2.book..590R.
  33. "Cosmic Recycling". Archived from the original on 7 September 2015. Retrieved 2 September 2015.
  34. Seligman, Courtney. "New General Catalogue objects: NGC 7800 - 7840". cseligman.com. Archived from the original on 19 February 2017. Retrieved 14 March 2017.
  35. Thackeray, A. D.; Wesselink, A. J. (1965). "A photometric and spectroscopic study of the cluster IC 2944". Monthly Notices of the Royal Astronomical Society. 131: 121–135. Bibcode:1965MNRAS.131..121T. doi:10.1093/mnras/131.1.121.
  36. SEDS: IC 2944
  37. "Messier 16". Archived from the original on 2018-10-04. Retrieved 2018-11-15.
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